package org.lkp.reggie.controller;

import org.lkp.reggie.response.R;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

@RestController
@RequestMapping("/common")
public class CommonController {
    // 文件上传路径
    @Value("${reggie.path}")
    private String basePath;
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) throws IOException {
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        String fileName = UUID.randomUUID() +suffix;
        File dir = new File(basePath);
        if(!dir.exists()){
            dir.mkdirs();
        }
        file.transferTo(new File(basePath+fileName));
        return R.success(fileName);
    }
    @GetMapping("/download")
    public  void download(String name, HttpServletResponse response){
        try {
            FileInputStream fileInputStream = new FileInputStream(basePath+name);
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jpeg");
            int len=0;
            byte[]bytes=new byte[1024];//每次读取一个字节数组
            while((len=fileInputStream.read(bytes))!=-1){
                outputStream.write(bytes,0,len);//将每次读取的字节数组写入到输出流中
                outputStream.flush();//清空缓冲区
            }
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}
